Home / 1,115.40-1,539.26-618.05

Finding the Fourth Proportional to 1,115.40, 1,539.26 and 618.05

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Solution

The fourth proportional to 1,115.40, 1,539.26 and 618.05 is: 852.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.40 : 1,539.26 = 618.05 : x
  2. Step 2: Convert to fraction form
    1,115.40/1,539.26 = 618.05/x
  3. Step 3: Cross multiply
    1,115.40x = 1,539.26 × 618.05
  4. Step 4: Simplify right side
    1,115.40x = 951,339.26
  5. Step 5: Solve for x
    x = 951,339.26/1,115.40
  6. Step 6: Final answer
    x = 852.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.